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I. HUBBELL.

MINING BIT.

APPLICATION FILED Nov. 26. 19u.

` 1,312,732. PatenIedAug.12,1919.

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I Gttozmugo ISAAC HUBBLL, 0F PEORIA, IIliLIN'OIISJ"` MINING-BIT.

Specification of Letters Patent.

Patented Aug; 12,` ,1919.

Application filed November 26, 1917. Serial No. 204,011.

T0 all 'whom it may concern: v

Be it known that I, IsAAo Hunnma cit1- zen of the United States, residing at Peoria, l

in the county of Peoria and State of Illinois, have invented a new and useful Mining-Bit, of which the following as a specification.

This inventionrelates to `bitsgfor use in connection with augers,vr such :as used' in coal mining, one of the objects of the invention being to provide bits Iwhich canbe attached readily to an augei1 and which will cut quickly into the coal without choking, this being due to the fact that the bits are arranged off center, thus to cut around a core which will chip 0E and permit the cuttings to pass readily from the hole produced by the bits.

Another object is to provide a bit so shaped as to be of the maximum strength, and which can cut through the hardest substances in the niine without quickly chilling, this being due to the shape lof the cutting edge and the temper.

With the foregoing and other objects in view which will appear as the description of the invention proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure l is a side elevation of an auger having attached thereto bits such as constitute the present invention.

Fig. 2 is a perspective view of one of the bits.

Fig. 3 is a front elevation of a bit.

Fig. 4 is an end view of a bit.

Referring to the iigures by characters of reference l designates an auger of the usual type but instead of being provided at one end with an integral' bit, as ordinarily, it is flattened to form a tongue 2 tapered toward its free end and provided along its center with spaced `openings 3. This tongue is adapted to extend between opposed similar bits which have been shown in detail in Figs. 2, 3 and 4 and which are made of tempered Vsteel capableof w-ithstandingtlie wearing action of very hard substances.

As shown in the drawings eachy bitfincludes a fiat attaching plate i having openings 5 'for the receptionof bolts ory the .like extending through the openings 3,(and extending laterally from one side/,edgej-.ofvthe platee isa fiange 6 which .graduallyincreases in width downwardly. The lower end of thaflangemerges into a cutting` blade 7 which is curved transversely thus to present a concave advancing edge and the lower or active edge of the blade is curved in the direction of its length and terminates at its outer end in a point 8 which is inadvance of the inner end of the cutting edge.

Thev flange 6 and the opposed edge of the plate 4 f converge downwardly so that when the plate is attached to the tongue 2 said flange and the opposed edge of plate 4 will register with the corresponding edges of the tongue.

In practice two bits such as described are secured to opposed faces of the tongue 2, as shown. The auger can then be used as ordinarily and, as the cutting edges of the bits are located away from the axis of rotation of the auger, it will be apparent that these bits will cut around a core which will thus chip away, allowing the bits to enter the coal freely without danger of choking. The advancing points 8 of the bits will cut into the coal and be followed by the curved' highly tempered cutting edges, the lcuttings working outwardly along the curved surfaces of the flanges 6 and theblades of thebits producing a cut that is almost semispherical. worn or broken it could be kremoved readily and another substituted, it being unnecessary to carry the entire heavy auger to the surface for this purpose.

What is claimed is 1. An auger havingopposed bits at one end of the auger, each including an outwardly extending flange merging at one endV Should one of the bits become wardly extending Hange merging at one end into a cutting blade, said blade being curved transversely and having a cutting edge curved from end to end and terminating at its outer end in a point Inovable in advance of its inner end, the two bits being oppositely disposed and having their blades crossed at opposite sides ot' the axisof rotation of the auger.

3. An auger having a tongue at one end, of similar bits secured to opposed faces respectively of the tongue, each bit including an attaching plate, and a iange extending outwardly from one side edge of the plate and merging at one end in a transversely curved cutting blade, said blade having a cutting edge curved from end to end and terminating at its inner end in a point and at its outer end 1n another point movable in advance of its inner end, the two bits having their blades crossed at opposite sides oi the axis of rotation of the auger.

4. An auger having broad bits at one end, said bits being oppositely disposed and crossed, each of the bits being bowed trans versely to present a concave advancing surface, the cutting edge being curved from one side to the other of the bit and terminating in inner and outer points, thevouter points being in advance of the inner points.

In testimony that I claim the foregoing as my own, I have hereto affixed iny signature in the presence of two witnesses.

ISAAC HUBBELL.

Witnesses GLADYS KAVANAUGH, BERTI-IA BAITY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

